三层不对称铁磁膜中的自旋波界面模

The Interface Modes of Spin Waves in an UnsymmetricalFerromagnetic Trilayer Film

研究了Ａ、Ｂ、Ｃ三层不对称铁磁膜，并利用界面重标度方法求解了自旋波的低能量子本征问题，得到了自旋波界面模．数值计算表明，当各层自旋相同时，只要各层的交换作用常数ＪＡ、ＪＢ、ＪＣ相差不大，且层间耦合作用常数ＪＡＢ、ＪＢＣ相差不太大时，界面处存在界面模，否则，仅在一界面处出现界面模或在表面出现表面模．若各层自旋不相同，则出现界面模的条件为ＪＡＳＡ、ＪＢＳＢ、ＪＣＳＣ之间和层间耦合作用常数ＪＡＢ、ＪＢＣ之间都相差不太大．

An unsymmetrical ferromagnetic trilayer film is investigated by using the recaling interface method.The quantum eigenproblem is calculated within low energy region.The numerical results show that,if the JA、JB、JC have not many diffevences and neither do JAB、JBC interface modes occur at the interface,or surface modes occur at the surface when trilayer spins are same,othewise,when trilayer spins aren′t same,the conditions of producing the interface modes are JASA、JBSB、JCSC have the little difference and either do JAB、JBC.